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[machines] Why does it take so long to mend an escalator? — lots of escalators being replaced on the London Underground at the moment… ‘Why does it take so long to mend an escalator? As far as that goes I am willing to believe what I am told: that escalators are big, complicated machines packed into tight shafts and there aren’t many hours when you can work on them. More money wouldn’t remove those obstacles to seamless service, nor would improved logistics. In fact, a large influx of capital would, in the short term, increase time-outs – it takes longer to replace an escalator than to maintain it – even though the end result would be fewer maintenance sessions.’ [via Feeling Listless]